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As suggested by @Mic92 in https://github.com/NixOS/nixpkgs/pull/111034 I'm submitting my fixes for the FriendlyARM NanoPC-T4 device. I'm not sure if forcing a specific kernel version is kosher, but on the other hand I don't know if my kernel config changes will work on any other version. I'm open to suggestions as to how to do this better. Also unusure if I should call the folder `friendlyarm` or `friendlyelec`. Signed-off-by: Jakub Sokołowski <jakub@status.im>
92 lines
3.3 KiB
Markdown
92 lines
3.3 KiB
Markdown
# Description
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This document on how I configure [NixOS](https://nixos.org/) on [NanoPC-T4](https://wiki.friendlyarm.com/wiki/index.php/NanoPC-T4).
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# Installation
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To install NixOS on you can follow the [official instructions](https://nixos.wiki/wiki/NixOS_on_ARM/NanoPC-T4) and use the [pre-built images](https://github.com/tmountain/arch-nanopct4/tree/main/images/) from @tmountain. You can also build the U-Boot image yourself from `nixpkgs` based on changes added in [#111034](https://github.com/NixOS/nixpkgs/pull/111034).
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## NixOS on NVMe with ZFS
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It is possible to migrate the OS from the eMMC storage to the NVMe.
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In my case I migrated `/`, `/nix`, and `/home`, leaving `/boot` on the eMMC.
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Create the ZFS pool and three filesystems on the SSD:
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```sh
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zpool create -O xattr=sa -O acltype=posixacl -O mountpoint=none rpool /dev/nvme0n1
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for VOL in nix root home; do
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zfs create -o mountpoint=legacy rpool/$VOL
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mkdir /mnt/$VOL
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mount.zfs rpool/$VOL /mnt/$VOL
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done
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```
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Then sync the original filesystem on eMMC to the new volumes:
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```sh
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rsync -rax /. /mnt/root
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rsync -rax /nix/. /mnt/nix
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rsync -rax /home/. /mnt/home
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rsync -rax /boot/. /
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```
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Afterwards create a configuration that looks like this:
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```nix
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{
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# TODO: Make sure to update the eMMC device UUID!
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fileSystems."/boot" = { device = "/dev/disk/by-uuid/1234-5678"; fsType = "ext4"; };
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fileSystems."/" = { device = "rpool/root"; fsType = "zfs"; };
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fileSystems."/nix" = { device = "rpool/nix"; fsType = "zfs"; };
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fileSystems."/home" = { device = "rpool/home"; fsType = "zfs"; };
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}
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```
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And rebuild he system:
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```sh
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sudo nixos-rebuild boot
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```
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:warning: __IMPORTANT:__ After that it's necessary to run all the four `rsync` commands again to sync filesystems.
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Once everything is synced you can finally reboot.
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You should also clean up `/boot` afterwards.
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# UART Debug Console
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Device provides a Debug UART 4 Pin 2.54mm header connection, 3V level, 1500000bps.
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To connect to you will need a USB to UART converter/receiver that supports the speed of 1500000bps.
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The serial port parameters are [8-N-1](https://en.wikipedia.org/wiki/8-N-1).
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A reader using `CP2102` chip did not work but `FT232RL` works fine:
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You can use `minicom` or `picocom` to connect:
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```
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sudo minicom -b 1500000 -D /dev/ttyUSB0
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sudo picocom -b 1500000 /dev/ttyUSB0
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```
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But you'll need to disable flow control with `Ctrl-A x`.
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Here is a good overview of UART USB-to-Serial adapters:
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* https://www.sjoerdlangkemper.nl/2019/03/20/usb-to-serial-uart/
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* https://www.ftdichip.com/Support/Documents/DataSheets/ICs/DS_FT232R.pdf
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Pin layout where #4 is next to USB-C port:
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| Pin num.| #1 | #2 | #3 | #4 |
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|---------|-----|----|----|----|
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| Purpose | GND | V5 | TX | RX |
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Remember that the `TX` and `RX` ports should be swapped between UART adapter and the board.
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The V5 pin does not need to be connected if you're powering the board from another source.
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See the full board diagram for more details:
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You can access the recovery console by holding the __Recovery__ button and then pressing the __Power__ button.
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For this to work the device will have to be off, which requires holding the __Power__ button long enough.
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